The full name is Tet Nguyen Dan, which means 'Feast of the First Morning'. Like Lunar New Year in China and Korea, it shares the same idea of a fresh start, but Vietnam's version has its own special flowers, foods and traditions.
In the north of Vietnam, families decorate their homes with pink peach blossom. In the south, where it is warmer, they decorate with bright yellow apricot blossom. Streets, shops and houses fill up with flowers in the days before Tet, until whole roads look like a giant garden.
The food is special too. Families spend days making banh chung - a square cake of sticky rice, mung beans and pork, wrapped in green banana leaves and boiled for hours. Round versions, called banh tet, are made in the south. Children get red envelopes (called li xi) containing a little 'lucky money' from grandparents and aunties.
Tet is mostly about family. People travel huge distances to be home with their grandparents, parents and cousins. The first visitor to step through the door on New Year's morning is said to bring luck for the whole year, so families think carefully about who comes in first. Children wear new clothes, sweep the house clean, and wish everyone a happy new year.